So far, I have given you an equation and asked you to graph it. Today, we did the opposite. You saw a graphed equation on a coordinate plane and had to come up with an equation for it.
Basically, we want to identify the change in the graph and reflect that change in our equation. Is there a change in period? How much? And where does that number go in the equation? Is there a change in amplitude? If so, how much, and where would we find that in the equation? The same is true for vertical and horizontal translations.
This concept is rather difficult to explain in words so please click the video link below to get two good examples of how to do this.
http://www.educreations.com/lesson/view/deriving-equations-from-graps/13711498/?s=35CfqD&ref=app
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